linux-kernel - RE: [PATCH 2/2] Drivers: scsi: storvsc: Force discovery of LUNs that may have been removed.

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Message-ID: <c5da85b38a2a4b26b9a7a7fadc40bcc2@BY2PR0301MB0711.namprd03.prod.outlook.com>
Date:	Tue, 26 Aug 2014 22:54:51 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	"hare@...e.de" <hare@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"ohering@...e.com" <ohering@...e.com>,
	"jbottomley@...allels.com" <jbottomley@...allels.com>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>
Subject: RE: [PATCH 2/2] Drivers: scsi: storvsc: Force discovery of LUNs that
 may have been removed.



> -----Original Message-----
> From: Christoph Hellwig [mailto:hch@...radead.org]
> Sent: Tuesday, August 19, 2014 10:55 AM
> To: KY Srinivasan
> Cc: hare@...e.de; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; ohering@...e.com;
> jbottomley@...allels.com; linux-scsi@...r.kernel.org; Martin K. Petersen
> Subject: Re: [PATCH 2/2] Drivers: scsi: storvsc: Force discovery of LUNs that
> may have been removed.
> 
> On Sat, Aug 16, 2014 at 08:09:48PM -0700, K. Y. Srinivasan wrote:
> > The host asks the guest to scan when a LUN is removed or added.
> > The only way a guest can identify the removed LUN is when an I/O is
> > attempted on a removed LUN - the SRB status code indicates that the
> > LUN is invalid. We currently handle this SRB status and remove the device.
> >
> > Rather than waiting for an I/O to remove the device, force the
> > discovery of LUNs that may have been removed prior to discovering LUNs
> > that may have been added.
> 
> This looks pretty reasonable to me, but I wonder if we should move this up
> to common code so that it happens for any host rescan triggered by sysfs or
> other drivers as well.
Ping. Any decision on if/when this patch may be checked in.

Regards,

K. Y

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